iTunes can't see other people on network

I'm on a network and i can only see one other person with iTunes, i know there are other people on the network sharing their files, for example my roommate, but i can only see one person. Is there something i'm missing?
Any help would be appreciated. thanks in advance.

For iTunes sharing to work, the other person has to be on the same subnet as you. For example both computers IP addresses would have to be 192.168.0.xxx. It would seem that your roommate would certainly be on the same subnet as you though, so I'm going to suggest double checking all firewall configurations.

I checked my roommates ip and it's the same, i can see other people on the network when i go to Finder>Network, so i can't think of whyi wouldn't be able to see them the odd thing is that my roommate, a guy on the other side of my dorm, and i can all see this guy named morrie, but none of can see each other. is there a way of telling iTunes where to search? Also, is it possible this guy has some way opened his connection more than we've opened ours. by the way my rommate has a windows PC, and the other guy i checked with has a Mac.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.